Naval News reports that,
Today, June 8th, the first Hull Vane for the Royal Netherlands Navy has been delivered in Den Helder. This Dutch invention consists of a submerged transom wing which renders ships more efficient and quieter, while improving their seakeeping.
This Hull Vane will be installed in early 2023 on the aft ship of the HNLMS Groningen, an ocean-going patrol vessel of 108 meter, pertaining to the Holland Class.
This decision is a strong endorsement for an innovation that appears directly applicable to US Coast Guard cutters. The Holland class Offshore Patrol Vessels are similar in size, power, speed, and hull form to the Bertholf class NSCs and particularly to the Argus class Offshore Patrol Cutters.
The hull vane reportedly recovers some of the energy that would normally be lost in creation of the wake. Fuel savings of 10% or more are reported. It also is reported to reduce pitch make for improved boat and helicopter operations.
Besides energy saving, which automatically leads to a reduction of CO2 emissions, the Hull Vane® also offers many tactical advantages for the ship. Due to the suppressed stern wave, the vessel leaves much less visible wake, making her less visible to satellites, drones and even certain types of torpedoes. Helicopter landings will be safer in rough weather, and it is expected that the slipway in the stern can be used more frequently to launch and recover the FRISC, a fast daughter craft. The ship will have a higher top speed, and will be able to cross a long distance faster, e.g. when being deployed for calamities. But above anything else, the goal is to reduce the dependency on diesel fuel. That is valuable in peace time, but even more so during war.
We have been following this promising innovation for the last seven years. Previous posts on this topic were:
- Hull Vane on an OPV, Sept. 2015
- Hull Vane Claims Improved Performance, June 2017
- Hull Vane Experiment on 52 Meter OPV, July 2018
- “Dutch Navy To Test Hull Vane Hydrofoil On HNLMS Zeeland OPV” –Naval News, Nov. 2020
Results of a 2018 test on the 172 foot, 409 ton French patrol vessel Themis, a vessel similar to the Webber class FRCs, included a “comparison with the benchmark sea trials – conducted in January in exactly the same conditions – by CMN’s sea trial team showed a reduction in fuel consumption of 18% at 12 knots, 27% at 15 knots and 22% at 20 knots. The top speed increased from 19.7 knots to 21 knots.”
The RN could have had 6 Holland’s for the price of 5 T31’s and would have been better served with that choice.
Personnally I think five Type 31s is the better deal, but I would have thought they would cost more than six Holland class, although the intigrated mast on the Holland class were reportedly very expensive.
I’m with you on that. The Type 31s offer more growth potential and versatility: VL systems, a range of guns, multiple hull and towed sensors, troop and logistic carrying capabilities, etc.
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It appears that this innovation could lead to a 20% reduction in fuel consumption at patrol speeds for most FRC and possibly OPCs. To me this is a no-brainer, allowing resources to be allocated elsewhere, like better armament. Installed either at construction or in a shipyard period, this could easily become as standard as fin stabilizers.
“Hull Vane B.V. Presents Its Innovative Products To The Hellenic Navy”
Hopefully the USCG will take a serious look at this when the Dutch OPV is tested.